CSS fixes, start implementing downloads.

Fix CSS charset detection.

Previously I didn't handle cases where the charset was unspecified,
or where it wasn't valid text in the charsets I trialled.

Extract URL resolver into 'hurl' hackage

Find links in the document (for interactions).

Add new URL & commandline arguments input interface.

Simplify CSS parsing with new Haskell Stylist API.

Integrate var(), @import, @document, @media, & @supports support.

Fix crash upon pause/rest-before/after: none

Style <aside>.

Upgrade Stylist dependency, fix default table styles.

I forgot that the content property replaces all children.

Don't use :not(), it's not supported by Stylish Haskell.

Load userstyles.

Support multi-valued CSS content: properties.

Refine user agent CSS...

* Read <img> alt, failing that src.
* I'll preprocess HTML forms to insert a better labeled link.
* type=button is never meaningful without JS.
* Insert alternatives to audio cues that don't come accross yet.

Render CSS counters into the webpage!

Fix counters parsing & usage.

Parse content & counter properties, cleanup property handling.

Integrate CSS Speech Box Model, improve user agent stylesheet.

Draft code for laying out CSS Speech Box Model.

Allow adjusting keyword values.